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What Is the Disease Affecting My Apple Trees

My apple trees are over 20 years old and have produced well over the years. Last year they became infected with a disease that is killing them. The disease shows up as small bumps and circles on the bark in a series of spirals that circle the tree trunk. This year the trees did not leaf out much or produce any fruit. I believe they are dying and I want to replace them but need to know how to protect new trees from the same fate.